A method for the preparation of vinyl fluoride and / or 1,1 - difluoro acetylene

摘要

1,207,870. Preparation of vinyl fluoride and/or 1,1 - difluoroethane. DAIKIN KOGYO CO. Ltd. 22 May, 1968 [24 May, 1967; 8 Aug., 1967], No. 24356/68. Heading C2C. CH 2 = CHF and/or CH 3 CHF 2 are prepared by reacting acetylene and HF in the vapour phase at 200-320‹ C. in the presence of CH 2 = CHF and/or CH 3 CHF 2 and, optionally, an inert gas such as N 2 and in the presence of a solid catalyst (e.g. AlF 3 ), under reaction conditions satisfying the relationship wherein Y is the molar ratio of CH 2 = CHF product to feed C 2 H 2 , F is the molar ratio of feed HF to feed C 2 H 2 and is from 1 to 4, F +Y being 2, V is the molar ratio of additive CH 2 = CHF (if present) to feed C 2 H 2 and is from 0À05 to 8, R is the molar ratio of additive CH 3 CHF 2 (if present) to feed C 2 H 2 and is from 0À05 to 8, P is the reaction pressure in atmosphere absolute, A is the molar ratio of inert gas (if present) to feed C 2 H 2 and B is a value calculated from the formula in which T is the reaction temperature in ‹ C. When CH 3 CHF 2 is the sole additive, the conditions satisfy the equation and when CH 2 = CHF is sole additive, the conditions satisfy the equation